Gas-washing apparatus



H. NIELSEN AND F. D. MARSHALL.

GAS WASHING APPARATUS.

APPL|CAT|0N FILED SEPT. 1i. 1920.

1.37%.,71 6. Patented May 17, 192i.

A A )i UNITI-:D STATES PATENT-orifice.

HARALD NIELSEN, OF-IIDDLESEX, AND FREDERICK DEACON MARSHALL, OF WEST- IINSTER, LONDON, ENGLAND. i

GAS-WASHING APPARATUS.

Specication of Letters Patent.

Patented May 17, 1921.

Application filed September 11,4192. Serial No. 409,654.

muori DEACoN MARSHALL, subject of the King of Great Britain, residing at, respectivel 13 Firs avenue, Muswell Hill, Middlesex, ngland, and 19 Queen Annes Chambers, Vestminster, London, England, have invented new and useful Improvements in Gas-Washing Apparatus, of which the following is a specification.

This invention relates to apparatus for washing, cooling and absorbing gas or gases and is particularly applicable to producergas plant of the kind known as by-products recovery plant although it is also applicable to other processes.

According to the invention our improved apparatus comprises a tower furnished with a number of internal shelves o1" false bottoms which extend alternately from opposite sides of the tower in an inclined direction, a space being left between the lower end of each shelf and the tower so that a very considerable zig-zig passage is provided for the free passage of the gas which enters at the bottom of the tower. .A number, preferably two, of revolving vertical shafts traverse the tower and extend through apertures in the shelves, and each shaft has keyed upon it anumber of spraying baskets, one basket or more than one basket on each shaft being located in the space comprised between each adjacent pair of shelves and the sides of the tower.

In order to guide the gas through the apparatus in the desired manner curtains comprising a number of depending strands as for example a number of short chains or equivalent pendant devices closely hung together may be suspended vertically in each compartment between the baskets so as further to divide the compartments.

The shelves are advantageously provided with ridges in order to collect the liquid atomized by the spraying baskets and to conduct the same toward the openings in the shelves through which shafts pass thereby freely and directly feeding the spraying baskets situated in the compartment below.

The bottom part of the tower may be arranged so as to form a suitable storage receptacle for the liquor.

It will be understood that by the above described arrangement of shelves and curtains the gas to be treated is constrained to follow the desired path and that only gas fully treated in one compartment is allowed to escape into the next, the said gas entering at the bottom of the tower, passing through the various compartments and A escaping at the top while the liquid for washing, cooling, or absorbing is led in at the top, leaving at the bottom on the countercurrent principle.

It will also be understood that a very efficient atomizing of the liquid is effected by the spraying baskets and this action is still further increased by the force of the drops striking the curtains formed Aby the pendant chains or the like and by liquid descending from the said curtains and dropping on to the inclined shelves and overflowing from the collecting ridges of the latter ina cascade like form, as by these means a subdivision of the liquid drops is promoted and an increased washing, cooling or absorption' effect upon the gases to be treated is provided.

To enable the invention to be fully un-4 derstood we will describe it by reference to the accompanying drawing, which shows in sectional elevation a suitable construction of apparatus embodying the features of the invention.

. In the said drawing a indicates the tower and the series of shelves or false bottoms which extend alternately from the opposite sides of the said tower in inclined directions and are of such a length that a space c is left -between the end of each shelf and the inside of the tower,whereby a zig-zag or tortuous passa e of relatively considerable extent is provided for the gas to be washed. This gas enters the tower through the inlet d at the bottom of the tower a and after traversing the superposed compartments therein provided by the inclined shelves, leaves the tower at the upper end through the outlet e, as indicated by the arrows.

fand g indicate two revolving vertical shafts which extend through the length of the tower and through vertically alined apertures in the shelves of greater diameter than the shafts, and k and 'i sprayin baskets keyed upon the said shafts, one suc basket being provided on each shaft in each compartment in the construction illustrated. These baskets, two of which are illustrated ,in section have their lateral walls provided tower is of relatively considerable ength..

with spraying a ertures as shown, and the baskets on each s aft are located in different horizontal planes from those on the adjacent shaft or shafts in the same compartment.

j indicates the curtains formedby lengths of chain, or other pendant devlces which are suspended in the compartments of the tower between the two shafts f and g so as to cause the ascending gas to pass 1n a sinuous course through such compartments.

7c indicates the inlet pipe for the washing, cooling or absorbing liquor to the to of the tower, the said inlet pipe being div1ded into two branches Z and fm. so as to direct the entering liquor into the two topmost baskets h and z' respectively, n indicates holes in the shelves b around the shafts f and g through which the liquor gravtates from each compartment into the baskets in the compartment immediately below and 0 are the upwardly extending vertical flanges or ridges on the lower side of these holes which serve the purpose of collectin the liquid and directing it through the oles.

is the storage receptacle which is rovided at the bottom of the tower for col ecting the liquid leaving the bottom compartment of the said tower.

As will be understood from the foregoing description the gas to be treated enters the bottom of the tower through the inlet d and thence passes in a sinuous course through each compartment and in a zig-zag path through the successive superposed compartments so that its passage throu h the In its passage, the direction of which is indicated by the arrows, it meets theliquor sprayed. from the baskets, passing through that from two baskets in each compartment until it finally leaves the tower through the outlet e..

Claim.

Apparatus for washing, cooling or absorbing gas, comprising a tower having a gas inlet adjacent to the bottom and a gas outlet adjacent to the top and being provided internally with inclined shelves extending from one side of the tower in a downwardly inclined direction nearly to the opposite.side, said shelves extending in alternation from opposite sides of the tower, to divide the tower into a series of compartments and form a zig-zag gas passage, said shelves being provided with vertically alined apertures, and vertically extending fianges adjacent to the lower edges of said apertures to facilitate the discharge of liquid therethrough, a plurality of vertical revoluble shafts extending through the tower each shaft passing through the vertically alined apertures in said shelves, a rotary spraying basket on each of said shafts above each of said shelves, and partitioning curtains formed by depending strands, located in each of said compartments above the respectivel shelves, and between the adjacent rotary shafts, the spraying baskets on each of said shafts being located in different horizontal planes from those on an adjacent shaft, and means for supplying liquid to the uppermost spraying basket of each shaft. Y

HARALD NIELSEN. FREDERICK DEACON MARSHALL. 

